Compiler errors when trying out custom_operator example

[Vasiliki (Vasia) Kalavri]

• register_logger expects 2 parameters: load_balance_factor is missing
• the compiler complains at inspect that index is out of scope (lines 44 and 57 ). That seems weird to me, but adding a move gets rid of the error.

[Malte Sandstede]

Added the issue upstream and activated issues on my fork!